In all the 25-year-old bagged 64 goals in 134 appearances for Diego Simeone's side.

He first joined the club from Braga in 2007, before spending time on loan at Braga, Celta and Albacete.Costa was then sold to Valladolid in 2009, however, Atleti invoked a buy-back clause 12 months later to bring him back to the Spanish capital.

Another loan spell to Rayo Vallecano followed in 2012, before he was handed a chance to impress in Simeone's first team.

Chelsea's Premier League rivals Liverpool made a bid for the player last summer, but their interest was knocked back by Atletico.